Digimon Frontier (デジモンフロンティア,Dejimon Furontia?), known as "Digimon 4" in South America, is the fourth Digimon TV series, first broadcast in 2002. News about this first came when it was officially announced by Toei in December 2001, when it was given the tentative title Digimon Scanners (デジモンスキャナーズ,Dejimon Sukyanāzu?). After prompted to do so by unusual phone messages, five children go to a subway station and take a train to the Digital World. There, they meet Bokomon and Neemon, who act as their guides and tell the children that the Digital World is being destroyed, and the children must fight the evil Cherubimon and his Legendary Warrior servants in order to save the world.

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Plot summary

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The goal of the DigiDestined is to save the world, and to achieve that goal, they are granted the power to "Spirit Evolve" into the Legendary Warriors. For this special kind of evolution, they use Spirits, artifacts created by the Ten Legendary Warriors that were hidden in certain areas of the Digital World. When the characters first arrive in the Digital World, their cell phones turn into digivices called D-Tectors. Each character actually acquires two Spirits each, the "Human Spirits" and the stronger "Beast Spirits", each with varying strengths and weaknesses. The DigiDestined mainly travel the world via railroads, where train Digimon called "Trailmon" act as a means of transport.

When the five DigiDestined arrive in the Digital World, they find themselves hunted by five other Legendary Warriors who serve the evil Cherubimon. After they defeat four of the enemy, Koji discovers that Duskmon, the fifth evil Legendary Warrior, is really his estranged brother Koichi. With Takuya's help, Koji is able to free his brother, and Koichi restores the Spirits of Darkness to their true forms to join the team as the true Warrior of Darkness, Loweemon.

After they defeat Cherubimon, the DigiDestined learn that the true mastermind is Lucemon, an ancient and corrupt angel Digimon whom the Ten Legendary Warriors sealed away in the Dark Area. The six DigiDestined must defeat his two Royal Knights before they scan away all of the Digital World, which would allow Lucemon to be released. Despite their efforts, Lucemon is freed and, after absorbing the Knights, digivolves into a stronger, more powerful form. The DigiDestined combine their power into a new ultimate warrior called Susanoomon, finally defeating Lucemon to save both the Digital World and the Real World.

Digital World

The Digital World is divided into ten regions, each one representative of one of the world's ten elements—Flame, Light, Ice, Wind, Thunder, Earth, Wood, Water, Steel and Darkness. A massive network of train tracks crisscross the planet, with a terminal in each region, allowing the train-like Digimon, the Trailmon, to ferry passengers from one region to the next. The most distinguishing feature of the Digital World is that everything exists in the form of fractal code—the "command code" for any data. Fractal code is usually hidden, but once it is either uncovered or has its key taken, it can be "digitized," which in turn "unlocks" the data of the item or individual in question, allowing it to be manipulated. In most cases, this leads to the data being absorbed—an action frequently perpetrated by the villains of the series. Conversely, if the Fractal Code is "rendered," it restores the data to its intended shape and form and "locks" it back into place. Lobomon: Warrior of Light If a Digimon has their fractal code scanned but their data is not completely absorbed, then it will reconfigure itself into a Digi-Egg, All Aboard which then transports itself to the Village of Beginnings, where, after being tended by Swanmon, it will hatch out into a new baby Digimon and start its life over again. Glean Eggs And Scram

In ancient times, the Digital World was wracked by a massive war between the human-type and beast-type Digimon. It was then that the angel Digimon, Lucemon, appeared and brought the war to an end, leading to a period of peace. Lucemon, however, eventually grew corrupted, becoming a tyrannical ruler, prompting the emergence of ten great Ten Legendary Warriors who embodied the ten elements. After a mighty battle, the Ten Legendary Warriors were able to defeat Lucemon and imprisoned him in the "Dark Area" deep within the center of the Digital World. Better An Egg Than An Egg Shell

Passing on into the realm of legend themselves and leaving powerful Spirits embodying their elements behind, the ten warriors were succeeded by a trinity of angelic Digimon known as the Celestial Digimon—Seraphimon, Ophanimon and Cherubimon. The group was not a harmonious one, unfortunately—the beast-type Cherubimon disagreed with many of the human-type Seraphimon and Ophanimon's policies, and made the argument one of the beast versus human. Mistakenly believing that the two human-types planned to betray him, the despairing Cherubimon found himself overtaken by the dark aura of Lucemon, and was transformed into a virus form. The evil Cherubimon then led the beast-type Digimon in a campaign against the human types, ultimately capturing Ophanimon and forcing Seraphimon into a regenerative coma. Operation: Free Ophanimon

To save the Digital World, Ophanimon calls upon children from Earth to merge with the spirits of the Legendary Warriors and become Digimon themselves to help free Cherubimon from Lucemon's influence. The new Legendary Warriors are eventually successful in freeing Cherubimon, but Lucemon, undeterred, soon gains enough power to consume the fractal code of the entire Digital World and destroy its moons. When Knights Fall... He then begins his conquest of Earth as well. Lucemon on the Loose In the last battle to save what remained of both worlds, the Legendary Warriors defeat Lucemon, allowing the Digital World and its inhabitants to be restored. End of the Line